Plot outline
The third season shows the second year of residence of J.D., Elliot and Turk, while in the fourth season, they have finished their residence and at last they are full doctors. However, their relation with the rest of the personnel in the hospital doesn’t changes too much.

Comment without spoilers
I decided to write the comment about the 3rd and the 4th seasons together because, as it happened with the second one, they don’t add anything different from the first one, giving you the feeling that nothing is evolving and that always is happening the same.

Aside from the the guest appearance of Michael J. Fox in the third season and the recurrent presences of Tara Reid in both seasons and Heather Graham in the fourth, there’s not much to tell about the cast, as they keep doing the same good work as always.

In the characters part, I have to say that the only one who evolves during the four seasons is Todd. I must admit that in the beginning I didn’t liked him, but currently is my favorite one. The music has the same importance as in the previous seasons.

So, they’re interesting seasons, but the truth is that they don’t offer anything new, and the series seems to be completely stuck. I hope this changes in the next one, or I’m afraid I won’t continue watching Scrubs.

Anyway, despite the announcement of the NBC saying that the 7th season is going to be the last, it seems that the ABC will buy it to produce, at least, an 8th season, due to the protests of Bill Lawence and Zach Braff about the cancellation of the series.